Simon Trummer produced a surprise fastest lap at the end of the second GP3 free practice session at Monza, in which title contenders Valtteri Bottas and James Calado opted not to take to the track.

The ART duo, who are separated by five points at the head of the drivers' standings, both watched the session from the pits as they took the unusual decision to save their tyres for the rest of the weekend.

Tom Dillmann occupied first place for the majority of the session, which contained several incidents. Alexander Sims went off the track and hit the tyre wall at the Parabolica within the first ten minutes, though he was able to rejoin. The same couldn't be said for fellow Brits Adrian Quaife-Hobbs and Lewis Williamson, who managed to clash at the same point, ending up in the gravel and bringing an early end to their sessions.

Dillmann looked set to take the honours until Trummer shaded his time by 0.031s at the end of the session after slipstreaming teammate Mitch Evans. Quaife-Hobbs ended up in third despite his incident, ahead of Evans, Gabby Chaves and Richie Stanaway.

Conor Daly, whose father Derek is the FIA driver steward at Monza this weekend, was seventh fastest, with Tamas Pal Kiss, Nigel Melker and Williamson completing the top ten.

Qualifying, where two all-important bonus points are available for pole position, takes place at 8:45 local time on Saturday morning.

Practice 2 times:

Pos Driver Team Time Gap Laps
1 Simon Trummer MW Arden 1:45.103   14
2 Tom Dillmann Addax Team 1:45.134 0.031 13
3 Adrian Quaife-Hobbs Marussia Manor Racing 1:45.142 0.039 6
4 Mitch Evans MW Arden 1:45.245 0.142 14
5 Gabby Chaves Addax Team 1:45.282 0.179 14
6 Richie Stanaway Lotus ART 1:45.379 0.276 8
7 Conor Daly Carlin 1:45.387 0.284 15
8 Tamas Pal Kiss Tech 1 Racing 1:45.415 0.312 13
9 Nigel Melker RSC Mucke Motorsport 1:45.447 0.344 13
10 Lewis Williamson MW Arden 1:45.467 0.364 6
11 Alexander Sims Status Grand Prix 1:45.638 0.535 13
12 Vittorio Ghirelli Addax Team 1:45.658 0.555 14
13 Antonio Felix da Costa Status Grand Prix 1:45.663 0.560 14
14 Nico Muller Jenzer Motorsport 1:45.727 0.624 13
15 Aaro Vainio Tech 1 Racing 1:45.802 0.699 13
16 Zoel Amberg Atech CRS GP 1:45.804 0.701 14
17 Matias Laine Marussia Manor Racing 1:45.867 0.764 15
18 Rio Haryanto Marussia Manor Racing 1:45.912 0.809 14
19 Michael Christensen RSC Mucke Motorsport 1:46.032 0.929 13
20 Nick Yelloly Atech CRS GP 1:46.051 0.948 13
21 Ivan Lukashevich Status Grand Prix 1:46.098 0.995 11
22 Marlon Stockinger Atech CRS GP 1:46.314 1.211 7
23 Callum MacLeod Carlin 1:46.353 1.250 13
24 Leonardo Cordeiro Carlin 1:46.446 1.343 13
25 Maxim Zimin Jenzer Motorsport 1:46.792 1.689 8
26 Thomas Hylkema Tech 1 Racing 1:46.872 1.769 13
27 Daniel Mancinelli RSC Mucke Motorsport 1:46.991 1.888 6
28 Christophe Hurni Jenzer Motorsport 1:47.709 2.606 13